A vertical takeoff and landing aircraft is superior in maneuverability, safety, and mobility. The method includes grouping a plurality of digital images to generate a plurality of groups. Responsive to the first computer application being unable to recognize the file format of the file, a second computer application within the plurality of computer applications is selected to execute the file. In some operations, processes are monitored by alarms, but the invention operates on either process data or alarm data. The mop head assembly includes a transverse support shaft, a pair of end caps positioned at opposite ends of the transverse support shaft, a pair of opposed substrate support surfaces positioned between and supported by the end caps, and a head mount coupled to the transverse support shaft centrally between the end caps.